If you really are going to drink Alcohol, you need to make sure your out of ketosis. Eat something like a couple of wholemeal slices of bread. Then I'd chose a spirit with a low cal mixer....i.e Bacardi and diet coke. Avoid lager, cider, all these bottled sweet drinks like hooch or bacardi breezers.
You go and have fun. Its just better to be safe then sorry.......so def make sure your out of ketosis.
xx